Portable drill press holder



June 7, 1949. F. P. s'nNcHcoMB i=onTABLE DRILL PnEss HOLDER Filed Oct. 19, 1945 0 w .W W W L W m Patented June 7, 1949 PRTABELDRILL BRES'S'iHODER Franllin B Stchcoml, Baltimore; M'd..

Application!October'll), 19%, ySerial No; 623357 2 Claims: 1,.`

This'= invention ixelates'; to drillingj" machinery morex'particularlym'toi a'iholding device' for open ating. ar. pprtb'ale':` drill under;` difficult.. circumfi stances. in a: stnu'ctural. iron: building Several. methods hazve. been employed in the handling; of; portab1e= drillsz on building work'. Most/off them: requireza clampfior: a chain thatis'. wound, aroundx; a: beam: and; used to'. hold.: the-4 drill in place while it yis.-r:lirectly.''manipulateddto force' the: drill 'z being. usedto; cutiin further.

It is an object of this invention to provide a new and improved! holder. unitiV for a portable drill that` will a.void...one..orv moreof the: disadvantages and limitations of thepmor art-.

Another object of this invention is to provide a new and improvedilfolder'unit" for a portable drill that can be attached'zautomatically and. see curelw to an iron beam .on other 'ferrou'sf surface employed to force the-dril=ling operation: to bezconyeniently done in thema-nner andxextent desired by'the user.

For a better understanding of the invention and for other objects thereof reference is made to the drawings and description provided, while the scope of the invention is particularly pointed out in the claims.

Referring to the drawings:

Figure 1 is a side elevation of a portable drill holder unit embodying this invention, with the portable drill attached to indicate the manner of its use;

Figure 2 is a side view of Figure 1;

Figure 3 shows rearrangement of parts to drill holes in Corners etc. and

Figure 4 is a sectional view taken along line 4-4 of Figure 1.

Similar reference characters pertain to similar parts throughout the drawings.

The holder unit structure of this invention consists of a trammel bar l of uniform rectangular cross-section and relatively long to afiord ample manip-ulation faoility and leverage in its use. One end portion H is made of a size and form suitable for manual and non-slipping operation,

as indicated. The opposite end portion, has a slip clamp mechanism |2 and |3 respectively formed on a guide and holding plate |4, to produce a cam-like reaction and clamping on a fiexible steel cable |5 passing through a channel |6 in it, as indicated in the drawings. The part |2 slides longitudinally on trammel bar IO and is tightened thereon by set screw 3|.

The cable |5 continues for some length and. terminates in an electromagnetic support attached to its end. The attachment of this end is made predetermined. amount of zadjustment thereon,

reason of. its swinging hinge 2'4. The. member 22' iszformed internallyI` to suit thecross-section. of thetrammel bar |llso that itcan slidelongiltudina'lly thereon.. It hasa set .screw 255passing,

transversely vthroughit topermit tightening, of

the-member atany. location onthe bar, vWhile the swing hinge' 24 can be. controlled `by, a.4 b'olt 2`6 passing through` it.-`

Service supply conductors 21, provide'electri'c current to. the electromagnetic. support |T. and

themotor drill-.'Zlz, simultaneouslybut eachpart Iw'lzand `2-I-is separately controllable by a separate switch-for each. If preferred, theconductor for the--electro:-'magnet-maybe run through the' steel cable=.| 5 .'in. az particular'way, and feed the electro.- magnetzini'azprotected manner.

In.. its:use;thef-electroemagnet support |'|,is magnetically attached. to an iron beam: or. other metallic part. oftheceiling, byl closing the. appropriate switch after' thefzsupportisfplaced-Vagainst the beam. The cable |5 is adjusted in the slip clamp mechanism |3 somewhat like a clothesline clamp until it has brought the trammel bar end portion on which it is situated into the required position in a Vertical plane. In this position the trammel bar becomes a lever for raising and lowering the motor drill 2| with the rope attachment forming the fulcrum. The portable drill 2| is then adjustably positioned by sliding the member 22 on the bar Ill and locking it in place with the screw 25. Then the drill is started, and the user with one hand against the vmotor drill 2| to guide it and the other pressing on the handle exerts the leverage and force on the turning drill tool in the motor drill 2| acting on the beam or work above, as indicated in Figures 1 and 4 does the drilling desired. After the drilling, the operator shuts off the motor 2| and the power to the electromagnetic support, and removes them to another location, as a unit. The clamp |3 is loosened from its Wedge-like hold on the cable |5 by moving it in a clockwise manner. This relieves the cable from the teeth of clamp and the pressure against the guide surface |6.

The arrangement is of compart and light structure, it works expeditiously and efiectively, and it has all the adjustments desirable in a device of this nature. It is relatively fiexible and resilient by reason of the use of the cable. The cable |5 by reason of its flexibility, as well as that of the eye |8 and hinged link 19 is of particular value in the use of the motor drill, in that it allows the latter and the handle mechanism connected with it, to be tilted from the vertical and thereby permit angular holes to be drilled, just as conveniently. The term cable used in the specifications is intended to be comprehensive enough to include rope and other fiexible items of a similar nature.

While but one general form of the invention is shown in the drawings and descrbed in the specifications, it is not desired to limit this application for patent to this particular form or in any other way otherwise than limited by the scope thereof, as it is appreciated that other forms of construction could be made that would use the same principles and come Within the scope of the appended claims.

Having thus described the invention, What is claimed is:

1. In combination with an electric motor including a tool operated thereby, of a magnetic supporting unit comprising in combination, a magnetic device for magnetic attachment to a ferrous object horizontally positioned and including an eye and fiexible link suspended therefrom, a cable coupled to said link and adapted to extend vertically down therefrom, a slip clamp mechanism mounted on said cable and including a holding plate with a wedgelilre acting member and guide opposing it for tightening on the cable as the mechanism is tensioned away from the said device, a trammel bar including a handle at one end adjustably attached to said plate for positioning the latter relatively to said cable and forming a fulcrum point for the bar, an adjustable member slidable on said bar and including a fiexible connection for fastening it to a portion of said motor, said member and handle being so positioned with respect to said portion of the motor as to enable the use of the unit to exert pressure under leverage by said handle with the cable and clamp as fulcrum to said motor and thereby facilitate the action of said tool, and electrical connections for said motor.

2. In combination with an electric motor including a tool operated thereby, of an electromagnetic supporting unit comprising in combination, an electromagnetic device for magnetic support to a ferrous beam or the like horizontally positioned and including an eye and flexible link suspended therefrom, a cable coupled to said link and adapted to extend vertically down therefrom, a slip clamp mechanism mounted on said cable and including a holding plate with a Wedgelike acting member and guide opposing it for tightening on the cable as the mechanism is tensioned away from the said device, a trammel bar including a handle at one end adjustably attached to said plate for positioning the latter relatively to said cable and forming a fulcrum point for the bar, an adjustable member slidable on said bar and including a flexible connection for fastening it to a portion of said motor for manipulating same said member and handle being so positioned with respect to said portion of the motor as to enable the user of the unit to exert pressure under leverage with said trammel bar With the cable and clamp as fulcrum onto said motor and thereby facilitate the action of said tool in its work While said device supports said mechanism and motor from said beam and conductors coupling said motor and device to a source of power for energizing them.

FRANKLIN P. STINCHCOMB.

REFERENCES CITED The following references are of record in the file of this patent:

'UNITED STATES PATENTS Number Name Date 1,010,975 Stroner et al Dec. 5, 1911 1,097,'709 Fosselman May 26, 1914 1,763,552 Cook June 10, 1930 2,374,875 McMurphy May l, 1945 

